Pneumatic tire

FIELD: transport.

SUBSTANCE: invention relates to vehicle tread pattern. Pneumatic tire (1) contains tread (2) which includes projections (23) formed by longitudinal grooves made in longitudinal direction of tire and by transversal grooves (24) crossing longitudinal grooves. The transversal grooves (24) in longitudinal direction of tire form multiple pitches (P1, P2 and P3) of tread pattern. In this structure, in the tread (2) shoulder, as tread pattern pitch decreases the volume ratio of transversal grooves (24) in the volume of portion corresponding to tread pattern pitch increases, and in the central zone of tread (2), as tread pattern pitch decreases the volume ratio of transversal grooves in the volume of portion corresponding to tread pattern pitch decreases.

EFFECT: higher stability of vehicle driving while keeping tread uniformity.

4 cl, 5 dwg

 

The technical FIELD

The present invention relates to pneumatic tires with variable pitch tread pattern, which provides improved stability of the vehicle control and uniformity of the tread.

The LEVEL of TECHNOLOGY

The tread pattern is known a pneumatic tire contains sections formed by longitudinal grooves, passing in the longitudinal direction around the circumference of the tire and lateral grooves crossing these longitudinal grooves. When used in this pneumatic tire changing step tread, in which the transverse grooves form a set of steps tread in the longitudinal direction, the noise caused by the tread pattern in the longitudinal direction, scatters in a wide frequency band that provides improved noise characteristics of tires.

For example, in unexamined patent application of Japan No. 2004-210133 (hereinafter patent document 1) describes the known design pneumatic tires with variable pitch tread pattern, in which to improve the uniformity of the tire (the heterogeneity of the tire causes a vibration in the steering wheel or vehicle) changes the cross section of the grooves, resulting in uniformity of rigidity of the tread on the tire circumference in the radial direction.

BRIEF description of the INVENTION

The problem to be solved by the present invention is directed,

In the above patent document 1 “tread stiffness” is determined by the amount of the vulcanized rubber used in the extrusion process of manufacturing tires. Accordingly, the pneumatic tire described in patent document 1, the amount of rubber used in the extrusion, is kept constant. In this regard, as used in the extrusion amount of rubber is changed, there is a tendency of increase of the transverse grooves in areas with reduced step tread, resulting in rigidity of the protrusions formed of longitudinal and transverse grooves in the tread, is reduced. Decreasing the stiffness of the ledges in the Central area, adjacent to the Equatorial plane of the tire, respectively, decreases the stability of vehicle control.

In accordance with the foregoing objective of the present invention is to provide a pneumatic tire containing the protector with the changing step pattern, which provides improved stability control while maintaining the uniformity of the tread.

Part of the SOLUTION

To solve the problems above and achieve the goal of a pneumatic tire described the data in the present invention, contains a plot of the tread having a longitudinal groove made around the circumference of the tire and lateral grooves intersecting the longitudinal grooves and forming many steps tread in the longitudinal direction, and in the shoulder area of the tread with decreasing step tread volume fraction of the transverse grooves in the volume of the area corresponding to the step of drawing increases, and in the Central zone with decreasing step tread volume fraction of the transverse grooves in the volume section, the appropriate step of the picture decreases.

In accordance with the design of the pneumatic tire described in the present invention, in the shoulder area of the tread with decreasing step tread volume fraction of the transverse grooves in the volume section, the appropriate step of the pattern increases. Therefore, in comparison with the known design of the tyre with the changing step tread, in which the amount of transverse grooves remains constant, since in accordance with the present invention, the volume ratio of the transverse grooves increases with decreasing step ledges, the volume of which decreases the amount of vulcanized rubber used in the extrusion process of manufacturing tires at each step tread (in the longitudinal direction of the tion), is kept constant. As a result, the heterogeneity of the tire in the shoulder area, which can cause vibration of the steering wheel or the vehicle is reduced. On the other hand, the use of pneumatic tires described in the present invention, in the Central zone of the tread as the decrease of the step tread volume fraction of the transverse grooves in the volume of the area corresponding to the step tread depth decreases. Therefore, in comparison with the known option tyre structure having variable pitch tread pattern, in which the volume of the transverse grooves is kept constant, since in accordance with the present invention, the volume ratio of the transverse grooves decreases with decreasing step ledges, the volume of which decreases the rigidity of the protrusions on each plot, the corresponding step tread (in longitudinal direction), is maintained constant. As a result, in the Central zone are excluded protrusions having substantially reduced rigidity, and therefore, increases the stability control of the vehicle. Thus, the stability control of the vehicle is increased while maintaining the uniformity of the tread.

In addition, for a pneumatic tire described in the present invention, the volume ratio of the transverse grooves is set by changing the width of the transverse grooves.

When using pneumatic tire described in the present invention, the above results can be obtained based on the design described above.

In addition, for a pneumatic tire described in the present invention, the volume fraction of the transverse grooves is set by changing the angle of inclination of the walls of the transverse grooves.

When using pneumatic tire described in the present invention, the above results can be obtained based on the design described above.

In addition, for a pneumatic tire described in the present invention, the volume fraction of the transverse grooves is set by changing the depth of the transverse grooves.

When using pneumatic tire described in the present invention, the above results can be obtained based on the design described above.

The results of the INVENTIONS

When using pneumatic tire described in this invention and containing protector with a changing step of drawing, enhances the stability control of the vehicle while maintaining the uniformity of the tread.

BRIEF DESCRIPTION of DRAWINGS

Figure 1 is a top view of a pneumatic tire in accordance with one embodiments of the present invention;

Figure 2 - simplified the view of the transverse grooves, presented in figure 1, the incision is made in the longitudinal plane;

Figure 3 is a simplified view of the transverse grooves presented in figure 1, the incision is made in the longitudinal plane;

4 is a simplified view of the transverse grooves presented in figure 1, the incision is made in the longitudinal plane; and

5 is a table containing the results of the performance test of a pneumatic tire made in accordance with embodiments of the present invention.

DETAILED description of the INVENTION

Next, with reference to the drawings provides a detailed description of one of the embodiments of the present invention. However, the present invention is not limited to this example embodiment of the invention. In addition, this embodiment of the invention contains elements that are essentially identical, or items that can be replaced by experts in the field of technology. In addition, different variants of the invention described in this embodiment, of the invention can arbitrarily be combined by experts in the field of technology.

In the following description, the term “transverse direction” indicates a direction parallel to the axis of rotation (not shown) of the pneumatic tire 1, the “inner side in the transverse n is the Board” means the party near to the Equatorial plane C bus (the equator of the tire) in the transverse direction, and the “outer side in the transverse direction” is a direction remote from the Equatorial plane C in the transverse direction. Further, the “longitudinal direction” refers to the longitudinal direction of the circumference of the tire rotation axis as the centerline. In addition, the “radial direction” is a direction perpendicular to the axis of rotation, inner side in the radial direction” refers to the side nearest the axis of rotation in the radial direction of the tire, and the “outer side in the radial direction" is a direction remote from the axis of rotation in the radial direction of the tire. “Equatorial plane C tire” means the plane perpendicular to the axis of rotation of the pneumatic tire 1 and passing through the middle of the width of the specified bus. “The tire equator is a line around the circumference of the pneumatic tire 1 and located in the Equatorial plane C bus. In this embodiment of the invention the equator of the tire indicated by the symbol “C” is similar to the symbol used to indicate the Equatorial plane of the tire.

A pneumatic tire 1 in accordance with this embodiment of the invention is intended for use in quality is as tires on a normal passenger car. As indicated in figure 1, the pneumatic tire 1 includes a tread 2. The protector 2, made of rubber, is located on the outer side in the radial direction of the pneumatic tire 1, and the tread surface is a profile of the pneumatic tire 1. The protector 2 contains surface 21, which represents a surface in contact with a road surface during movement of the vehicle (not shown in the figures)on which the pneumatic tire 1.

On the surface 21 of the protector is made a plurality of longitudinal grooves 22, passing in the longitudinal direction. Longitudinal grooves 22 in accordance with this embodiment of the invention includes four main longitudinal grooves 22a and two narrow longitudinal grooves 22b, performed on the surface 21 of the tread. In addition, many major longitudinal grooves 22a forms on the surface 21 of the tread many protrusions 23 in the form of ribs, passing in the longitudinal direction parallel to the equator C bus. In accordance with this embodiment of the invention on the surface 21 of the tread, there are five rows of protrusions 23, limited passing in the longitudinal direction main grooves 22a. The tabs 23 contain the first element 23a of the ledge, situated on the equator C bus, the second element 23b high the UPA, located on the outer side in the transverse direction relative to the first element 23a of the protrusion, and the third element 23c protrusion placed on the outer side in the transverse direction relative to the second element 23b of the ledge, which is an extreme outer side surface 21 of the tread in the transverse direction. The second element 23b of the protrusion includes a narrow longitudinal grooves 22b.

Transverse grooves 24 intersecting the longitudinal grooves 22 (main longitudinal grooves 22a), provided in each element (23a, 23b, 23c) of the protrusion 23 of the surface 21 of the tread. One end of the transverse grooves 24 in the first element 23a of the ledge that is open and goes to the main longitudinal grooves 22a, and the second end is closed, and the grooves made in the form of cutouts 24a arranged at an angle to the transverse and longitudinal direction. The cutouts 24a is designed in such a way that opposite cutouts 24a are sloped in opposite directions relative to the equator line C bus as the centerline.

In addition, one end of the transverse grooves 24, made in the second element 23b of the ledge that is open and goes to the main longitudinal grooves 22a on the outer side in the transverse direction, and the other end opened into a narrow longitudinal grooves 22b, and these grooves are made in the form of inclined kanavo the 24b, odd-shaped and angled to the transverse and longitudinal directions. Inclined grooves 24b are designed so that the opposite inclined grooves 24b are sloped in opposite directions relative to the equator C bus as the centerline.

In addition, the transverse grooves 24 provided in the third element 23c hanging, made in the form of the first arcuate grooves 24c having a curved shape and extending from the outer edge surface 21 of the tread to the inner side in the transverse direction, and the inner end of the groove is open in the main longitudinal grooves 22a and second arcuate grooves 24d having a curved shape and extending from the edge surface 21 of the tread to the inner side in the transverse direction of the tire, and the inner end of the groove is closed. The first arcuate grooves 24c and second arcuate grooves 24d are arranged alternately in the longitudinal direction of the tire. The first arcuate grooves 24c and the second arcuate groove 24d is designed in such a way that opposite the first arcuate grooves 24c and second arcuate grooves 24d bent in opposite directions relative to the equator C bus as the centerline.

In the pneumatic tire 1 in accordance with this embodiment of the invention, described above, is used from which anaysis step tread, moreover, the transverse grooves 24 located in the longitudinal direction around the circumference of the tire, form a set of steps tread. In connection with the use of the specified variable step tread noise, due to the tread pattern in the longitudinal direction, is dispersed in a wide range of frequencies, providing improved noise characteristics. It should be noted that the step tread in the longitudinal direction of the tire may be changed periodically or randomly.

In the pneumatic tire 1 in accordance with this embodiment of the invention for changing the step tread is set to a certain value of the volume fraction of the transverse grooves 24 in the volume of the area corresponding to the step tread. The volume of the area corresponding to the step tread, is defined as the volume of the projections 23, including transverse grooves 24, and the size of the area in the longitudinal direction of the tire is limited to one step of the pattern formed by transverse grooves 24, passing up of the breaker 3, representing the boundary surface in the radial direction, and the size of the area in the transverse direction of the tire is defined by the main surface of the longitudinal grooves 22a forming the protrusions 23 and transmitted to the belt 3, representing the boundary surface plot glad the real direction. In addition, the volume fraction of the transverse grooves 24 defined as the proportion of the internal volume of the transverse grooves 24 in the total area corresponding to the step tread.

As regards the definition of the volume fraction of the transverse grooves in the shoulder area Ws tread 2, indicated in figure 1, with decreasing step of drawing the volume fraction of the transverse grooves 24 in the volume of the area corresponding to the step tread increases, and in the Central zone Wc tread 2 with decreasing step of drawing the volume fraction of the transverse grooves 24 in the volume of the area corresponding to the step tread depth decreases. In this case, the shoulder area Ws represents a portion of a tread located in the transverse direction outer side from the main longitudinal grooves 22a, the centerline of which is placed at a distance corresponding to 35% of the total width Wt (the distance between the extreme points of the surface 21 of the tread in the transverse direction) of the protector from the outer edge in the transverse direction, and the Central area Wc represents a portion of a tread located in the transverse direction inner side from the main longitudinal grooves 22a, the centerline of which is placed at a distance corresponding to 35% of the total width Wt of the tread, from the outer edge in the transverse direction.

Vol whom I share the transverse grooves 24 in the volume section, the corresponding step tread, is set by changing at least one of the parameters, such as width W (the width of the opening groove in the longitudinal direction) of the transverse grooves 24, the angle θ of inclination of the wall (the angle of the wall relative to a line perpendicular to the surface 21 of the tread in the longitudinal plane of the tire) of the transverse grooves 24 and the depth D of the transverse grooves 24.

Figure 2 presents an example implementation of the present invention, according to which the volume fraction of the transverse grooves 24 in the volume of the area corresponding to the step tread, is set by storing constant values of the angle θ of inclination of the wall and the depth D of the transverse grooves 24 and changes the width W of the grooves. In addition, figa presents the projections 23, located in the shoulder area Ws, and figv specified protrusions 23, located in the Central area of Wc. Next, in figure 2, the centerline of the transverse grooves 24 provided in the longitudinal direction as delimiters steps tread and it is shown that the steps tread consistently decrease from step P1 to steps P2 and P3.

In particular, as indicated on figa in the shoulder area Ws tread 2 in the increase of the grooves due to an increase in the width W of the grooves decreasing step of the drawing, is set high the f is the volume fraction of the transverse grooves 24 in the volume section, the corresponding step tread. On the other hand, as shown in figv, in the Central zone Wc protector 2 by decreasing the volume of the grooves caused by the reduction in the width W of the grooves decreasing step of the drawing, a low value of the volume fraction of the transverse grooves 24 in the volume of the area corresponding to the step tread.

Figure 3 presents an example implementation of the present invention, in which the volume fraction of the transverse grooves 24 in the volume of the area corresponding to the step tread, is established by maintaining a constant width W and depth D of the transverse grooves 24 and the tilting angle θ of the walls of the grooves. In addition, figa specified protrusions 23, located in the shoulder area Ws, and FIGU - ledges 23, located in the Central area of Wc. Next, in figure 3 the centerline of the transverse grooves 24 provided in the longitudinal direction as delimiters steps tread and it is shown that the steps in the figure are progressively smaller from step P1 to steps P2 and P3.

However, as described in figa in the shoulder area Ws tread 2 in the increase of the grooves caused by the decrease in the angle θ of inclination of the walls of the grooves decreasing step of the drawing (in particular, by straightening the walls of the transverse grooves 24), you set the acoe is the volume fraction of the transverse grooves 24 in the volume section, the corresponding step tread. On the other hand, as shown in figv, in the Central zone Wc protector 2 by decreasing the volume of the grooves, due to the increase of the angle θ of inclination of the walls of the grooves decreasing step of the drawing (in particular, by increasing the inclination of the walls of the transverse grooves 24), set low value of the volume fraction of the transverse grooves 24 in the volume of the area corresponding to the step tread.

Figure 4 presents an example implementation of the present invention, in which the volume fraction of the transverse grooves 24 in the volume of the area corresponding to the step tread, is established by maintaining a constant width W and the angle θ of inclination of the walls of the transverse grooves 24 and changing the depth D of the grooves. In addition, figa presents the projections 23, located in the shoulder area Ws, and FIGU - ledges 23, located in the Central area of Wc. Next, in figure 4 the centerline of the transverse grooves 24 provided in the longitudinal plane as delimiters steps tread and it is shown that the steps in the figure are progressively smaller from step P1 to steps P2 and P3.

In this case, as presented on figa in the shoulder area Ws tread 2 in the increase of the grooves caused by the increase in the depth D of the grooves decreasing step picture about what the sector (in particular, by increasing the depth of the transverse grooves 24)is set to a high value of the volume fraction of the transverse grooves 24 in the volume of the area corresponding to the step tread. On the other hand, as indicated on FIGU, in the Central zone Wc protector 2 by decreasing the volume of the grooves caused by the reduction of the depth D of the grooves decreasing step tread (in particular, by reducing the depth of the transverse grooves 24), set low value of the volume fraction of the transverse grooves 24 in the volume of the area corresponding to the step tread.

Thus, when using the pneumatic tire 1 in accordance with this exemplary embodiment of the present invention in the shoulder area Ws tread 2 with decreasing step tread volume fraction of the transverse grooves 24 in the volume of the area corresponding to the step tread increases. Therefore, in comparison with the known option tyre structure having variable pitch tread pattern, in which the amount of transverse grooves 24 is kept constant, since in accordance with the present invention, the volume ratio of the transverse grooves 24 increases with decreasing step protrusions 23, the volume of which decreases the amount of vulcanized rubber used in extrud is the formation process of manufacturing each plot, the corresponding step tread (in longitudinal direction), is kept constant. As a result of this reduced heterogeneity of the tread in the shoulder area Ws, which can cause vibration of the steering wheel or the vehicle as a whole.

On the other hand, the use of pneumatic tires 1 according to the embodiment of the invention in the Central zone Wc tread 2 with decreasing step tread volume fraction of the transverse grooves 24 in the volume of the area corresponding to the step tread depth decreases. Therefore, in comparison with the known option tyre structure having variable pitch tread pattern, in which the amount of transverse grooves 24 is kept constant, since in accordance with the present invention, the volume ratio of the transverse grooves 24 decreases with decreasing step protrusions 23, the volume of which decreases the rigidity of the protrusions 23 on each plot, the corresponding step tread (in longitudinal direction), is maintained constant. This eliminates a significant reduction in the rigidity of the protrusions 23, located in the Central zone Wc, and therefore increases the stability of vehicle control.

Therefore, when using pnevmaticheskoy 1 in accordance with this embodiment of the invention increases the homogeneity of the shoulder area Ws tread 2 and the stability control of the vehicle, which is determined by the characteristics of the Central zone Wc, and since this ensures the separation of functions, stability control is increased while maintaining the uniformity of the tread of the pneumatic tire 1 having a structure with a variable pitch tread pattern.

In addition, when using pneumatic tire 1 in accordance with this embodiment of the invention, the difference (difference of volume fractions) between the volume fraction of the transverse grooves 24 in the volume of the area corresponding to the step tread, with a minimum step of the pattern and volume fraction of the transverse grooves 24 in the volume of the area corresponding to the step tread, at the maximum step of the drawing is preferably set in the range of 0.5% to 1.5%. In particular, in the shoulder area Ws, the difference of volume fractions, which is determined by subtracting the volume fraction of the transverse grooves 24 in the volume of the area corresponding to the step tread, at the maximum step of the volume fraction of the transverse grooves 24 in the volume of the area corresponding to the step tread, with the minimum step is set in the range from 0.5% to 1.5%in the Central zone Wc difference volume fraction, which is determined by subtracting the volume fraction of the transverse grooves 24 in the volume section, the appropriate step of the pattern p is otector, at the minimum step of the volume fraction of the transverse grooves 24 in the volume of the area corresponding to the step tread, when the maximum step is set in the range from 0.5% to 1.5%.

If the difference between the volume fractions in the shoulder area Ws is less than 0.5%, there is no uniformity in the number of vulcanized rubber, extruded during the manufacturing process of each plot, the corresponding step tread (in the longitudinal plane), and thus, uniformity is increased slightly. On the other hand, if the difference between the volume fractions in the shoulder area exceeds 1.5%, the rigidity of the protrusions 23 in areas of low values of the step tread is reduced, resulting in reduced stability control of the vehicle. In addition, if the difference between the volume fractions in the Central zone Wc less than 0.5%, it is not ensured uniformity of hardness of the projections 23 on each plot, the corresponding step tread (in the longitudinal plane), and thus, the stability control of the vehicle increases slightly. On the other hand, if the difference between the volume fractions in the Central zone Wc exceeds 1.5%, then do not provide sufficient stiffening protrusions 23 on sites with low values of the step tread and, thus, stability control transport environments is the your increased slightly.

EXAMPLES of carrying out the INVENTION

This section presents the results of performance tests conducted using different types of pneumatic tyres under various conditions to determine the stability of the vehicle control (initial reaction) and uniformity of the tread (see figure 5).

Method of assessing the stability control of the vehicle provided for the mounting of a pneumatic tire size 175/65R15 on a conventional wheel rim ("standard rim" according to the definition manufacturers Association the Japan automobile tire (JATMA), "test rim" in accordance with the definition of the Association of manufacturers of tyres and rims (TRA) or "measuring rim" as defined in the European technical organization for tire and rim (ETRTO)). Pneumatic tyres were inflated to achieve an air pressure of 230 kPa and installed on the test vehicle (passenger car of class hatchback made in Japan engine capacity of 1.3 liters). This was followed by assessment of the drivers of the initial reaction of the vehicle when changing the test vehicle lanes during rectilinear motion with a speed of 100 km/h to determine the stability of the control car, and the results obtained for the known pneumatic tyres, used as a baseline. Next was a calculated average value of evaluation points, these five drivers, which were used for comparison with the original score of 100. Preferred are the high values of the indicator because they show increased stability of vehicle control.

In addition, the method of assessing the homogeneity of the protector is provided for mounting a pneumatic tire size 175/65R15 on a conventional wheel rim (“standard rim” according to the definition manufacturers Association the Japan automobile tire (JATMA), “test rim” in accordance with the definition of the Association of manufacturers of tyres and rims (TRA) or “measuring rim” as defined in the European technical organization for tire and rim (ETRTO)). Pneumatic tyres were inflated to achieve an air pressure of 200 kPa and was applied load of 3.43 kN. To measure changes in radial forces in accordance with the standard C607 organization of motor vehicle standards of Japan (JASO) has been used device for measuring radial forces (ILLUSTRATED). Further, according to the variations of the radial effort was conducted by the estimated score and the baseline score for the known pneumatic tire 100. The value of uniformity to 97 is quite high.

In known pneumatic the bus is not used design with variable pitch tread pattern, and transverse grooves having the same volume, are performed with a constant step tread. On the other hand, in the pneumatic tire, presented in examples 1-8, using variable step tread. In the shoulder zones of the tread as the decrease of the step tread volume fraction of the transverse grooves in the volume of the area corresponding to the step tread increases, and in the Central zone of the tread as the decrease of the step tread volume fraction of the transverse grooves in the volume of the area corresponding to the step tread depth decreases. In addition, the difference of volume fractions in the Central zones and shoulder areas of the tread of the pneumatic tires according to examples 1-3 and examples 5-7 are installed in the required range (from 0.5% to 1.5%).

According to the test results, presented in figure 5, each of the pneumatic tires according to examples 1-8 have provided improved stability of control of the vehicle while maintaining the uniformity of the tread.

INDUSTRIAL APPLICABILITY

As described above, the pneumatic tire described in the present invention, provides improved stability of control of the vehicle while maintaining the uniformity of the tire tread with the changing step tread.

The CATEGORY IS ERY REFERENCE POSITIONS

1 is a pneumatic tyre

2 - the protector

21 - the tread surface

22 is a longitudinal groove

22a - main longitudinal groove

22b is a narrow longitudinal groove

23 - ledge

23a - the first element of the ledge

23b is a second lip

23c is the third element of the ledge

24 is transverse groove

24a - neckline

24b is an inclined groove

24c is the first arcuate groove

24d - second arcuate groove

3 - breaker

C - the Equatorial plane of the tire (the tire equator)

P1, P2, P3 - step tread

Wc - Central area

Ws - shoulder area

Wt - full tread width

W - the width of the groove

θ is the angle of inclination of the wall of the groove

D is the depth of the groove

1. Pneumatic tire containing protector, which includes protrusions formed longitudinal grooves, passing in the longitudinal direction of the tire and lateral grooves intersecting the longitudinal grooves and transverse grooves in the longitudinal plane form a set of steps tread,
thus the volume fraction of the transverse grooves in the volume of the area corresponding to the step tread in the shoulder area of the tread as the decrease of the step tread is increased, and the volume fraction of the transverse grooves in the volume of the area corresponding to the step tread, in the Central zone about which the sector decreasing step tread is reduced.

2. Pneumatic tire according to claim 1, in which the volume fraction of the transverse grooves is set by changing the width of the transverse grooves.

3. Pneumatic tire according to claim 1, in which the volume fraction of the transverse grooves is set by changing the angle of inclination of the walls of the transverse grooves.

4. Pneumatic tire according to claim 1, in which the volume fraction of the transverse grooves is set by changing the depth of the transverse grooves.



 

Same patents:

FIELD: transport.

SUBSTANCE: tire tread has at least two wearing plies including outer wearing ply and at least one inner wearing ply located at mid tread under outer wearing ply, and at least one outer groove located in outer wearing ply. Besides, said tread features volumetric cavity ratio of 0.25-0.40 in sound state and of about 0.25-0.40 in worn-out state. External side interacting with ground extends along one of inner wearing ply in worn-out tread. Additionally, said tread features contact surface ratio of 0.66-0.72 in sound state and of about 0.56-0.66 in worn-out state.

EFFECT: enhanced performances.

15 cl, 19 dwg

Pneumatic tire // 2521052

FIELD: transport.

SUBSTANCE: invention relates to tread pattern of automobile non-spiked tire with improved noise characteristics. Pneumatic tire includes axially-internal lengthwise rows of crown blocks which rows are located at each side of tire equator, and axially-external lengthwise rows of shoulder blocks which rows are located axially to the outside of axially-internal lengthwise rows. Crown blocks are longitudinally separated by the first and the second interleaving transverse grooves of the crown. Shoulder blocks are longitudinally separated by the first and the second interleaving transverse shoulder grooves. The first transverse shoulder grooves have width of not less than 3.5 mm. The first transverse crown grooves have width of not less than 2.0 mm. The second transverse shoulder grooves include axially-internal slit-shaped portion with width of 0.5 to 2.0 mm and axially-external main portion at least 3.5 mm wide. The second transverse crown grooves include axially-internal slit-shaped portion with width of 0.5 to 2.0 mm and axially-external main portion at least 2.0 mm wide.

EFFECT: better tire noise characteristics without impairment of running characteristics over snow-covered road surface.

9 cl, 5 dwg, 1 tbl

Pneumatic tire // 2520265

FIELD: machine building.

SUBSTANCE: proposed tire comprises tread zone (A) located from vehicle inner side and tread zone (B) located on vehicle outer side. There are multiple slot-like drain grooves (32A, 32B) extending over tire width and formed in every block (31A, 31B). The number of blocks (31A) in said zone (A) is larger than that of blocks (31B) in said zone (B). Note here that slot-like drain grooves (32B) in blocks (31B) of zone (B) are configured to extend linearly along their depth. Note here that slot-like drain grooves (32A) in blocks (31A) of zone (A) are configured to extend in wavy manner along their depth.

EFFECT: better road grip on dry road and snow.

7 cl, 4 dwg

Pneumatic tire // 2519327

FIELD: transport.

SUBSTANCE: method is executed by means of making multiple wave-shaped grooves (20) in central belt (16) of tread between two ring grooves (14) located with tilt relative to equatorial plane of tire and consisting of central small elements (26) equatorial plane CL and side small elements (28) at two sides of this equatorial plane. In each of side small elements (28), the second transversal groove (40) is made containing wide area (42) and narrow area (44). Reducing fragmentation of rubber and cracking in side small elements (28) is achieved due to formation of area (54) with raised bottom on periphery of the first acute-angled area (50) and formation of the first bevelled area (56A) on sharp end of the first acute-angled area (50).

EFFECT: lower noise level, rubber fragmentation and cracking in tread elements, higher dewatering capability.

4 cl, 3 tbl, 13 dwg

FIELD: transport.

SUBSTANCE: tread contains multiple grooved obstructing elements (4) which are formed by and located in circular grooves (2). Herewith, obstructing elements (4) go from bottom (21) of circular groove (2) and blocks at least 70% of cross-section area of circular groove (2). Bending parameter of grooved obstructing elements (4) is determined as E·I/(h3l), where E is module at 10% elongation of material used for grooved obstructing elements, I is inertia moment of grooved obstructing element cross-section, h is height of grooved obstructing element, and l is width of grooved obstructing element, and ranges from 250 Pa to 350 Pa.

EFFECT: providing grooved obstructing elements wear to degree equivalent to tread section wear degree while reducing noise caused by resonance of air columns and maintaining retraction characteristics.

6 cl, 6 dwg, 1 tbl

Pneumatic tire // 2513210

FIELD: transport.

SUBSTANCE: invention relates to tread pattern of tire designed to be used on dry road, ice- and snow-covered roads. Proposed tire comprises unidirectional tread pattern including right and left lengthwise grooves of the crown and crow rib arranged there between. Crown rib has first and second V-like grooves arranged by turns in the tire lengthwise direction. First V-like grooves extend from the left lengthwise groove of the crown. Second V-like grooves extend from the right lengthwise groove of the crown. First and second V-like grooves terminate nearby the rib while their V-like configurations have inflections located, in fact, at tire equator.

EFFECT: stable motion on dry road, ice- and snow-covered roads.

9 cl, 10 dwg, 1 tbl

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, namely, to tread pattern. Tire features tread asymmetric patter wherein ratio of actual area of contact to total area for zone 2o of outer side is larger than that for inner side zone 2i but with minor difference characteristic of water removal for right and left wheel tires. Said tire has tread surface 2 divided by four lengthwise grooves 3 and 4 into central area 5 of contact with soil, mid areas 6,6 of contact with soil and shoulder areas 7,7 of contact with soil. Said mid area 6o and shoulder area 7o in outer side zone 2o are divided by outer mid transverse grooves 8o and outer shoulder transverse grooves 10o into blocks 9o and blocks 11o. Mid transverse grooves 8o are inclined in opposite direction to inclination of shoulder transverse grooves 10o relative to tire axial direction while transverse grooves 8o and 10o are inclined at angle θmo of 5-45° and at angle θso over 0° and not over 40°, respectively.

EFFECT: better stability in rainy and dry weather.

8 cl, 6 dwg, 1 tbl

FIELD: transport.

SUBSTANCE: tread comprises multiple raised elements 10 confined by cutouts. At least one of said raised elements 10 has dents 2 of maximum depth H not larger than tread thickness. This dent is located in major direction confined by the dent track ends on new tread and in minor direction extending in tread depth. Dent 2 has first part 21 and second part 22. Dent first part 21 extends in minor direction between contact side 15 in new state and depth H1 equal to, at least, 40% of maximum depth H while second part 22 extends the first part 21 in tread depth. Note here that said second part 22 extends to depth H2. Dent second part 22 in major direction has at least one first section 221 and one second section 222.

EFFECT: improved performances.

10 cl, 7 dwg

FIELD: transport.

SUBSTANCE: tread 2 has rounded shoulders and is divided by the main lengthwise grooves 3 and crosswise grooves 4 in blocks 5 furnished with pockets 6, each having zigzag part 8. Lengthwise grooves 3 include at least two axially outer lengthwise grooves 3o dividing the tread 2 into shoulders Ysh and crowns Ycr wherein zigzag part 8 of pockets 6sh in shoulders Ysh features larger zigzag amplitude Wsh and larger zigzag pitch Psh that zigzag amplitude Wcr and zigzag pitch Wcr of zigzag part 8 of pockets 6cr in crowns Ycr. Inclination angle θsh of pockets 6sh relative to axial direction is smaller than angle θcr.

EFFECT: improved flotation at dry road at minimum deterioration of performances on snow-covered road.

7 cl, 7 dwg, 1 tbl

Air tire (versions) // 2506171

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, namely, to tread pattern of stud-free tire. One block of air tire has first and second slitted drain grooves. Every said groove extends in tire width direction. Said grooves are regularly spaced apart in tire circumference. First and second said grooves has first parts of slitted rain groove that features linear shape if seen in the plane. The slitted drain groove second part that features zigzag shape if seen in the plane and is connected with slitted drain groove first part. First part of slitted drain groove has two surfaces of slitted and opposed drain groove walls if seen in direction perpendicular to the length of said slitted drain groove. Said first part comprises the ledge arranged on first surface of said walls and recess arranged second surface of said walls to make recess connected with ledge.

EFFECT: better running on ice and snow.

20 cl, 20 dwg, 1 tbl

Pneumatic tire // 2523539

FIELD: transport.

SUBSTANCE: pneumatic tire 1 having excellent snow-running characteristics while keeping control stability and resistance to uneven wear, including tread 2 containing a pair of longitudinal crown grooves running continuously in longitudinal direction of tire at both sides of tire equator C and having edges, where one edge 3m runs in zigzag fashion, so that L-shaped sections 3s of groove edge are continuously interconnected in tire longitudinal direction, and the other edge 3n runs in corrugated manner so that arc-shaped sections of groove edge 3o having arc-shaped convexity towards groove centre are continuously interconnected in tire longitudinal direction where each section 3s of L-shaped groove edge includes long portion 3c inclined at angle of 1 to 20° relative to longitudinal direction, and short portion 3t with longitudinal length less than this value for long portion 3c and inclined in direction opposite to direction of the mentioned long portion 3c relative to longitudinal direction.

EFFECT: improved characteristics.

17 cl, 1 tbl, 10 dwg

FIELD: transport.

SUBSTANCE: tire has tread (1) including at least one groove (3) of circular orientation and multiple raised elements (21, 22). Note here that every said raised element comprises contact side (11) with crosswise width Lt and lateral walls (210). Note also that there is at least one raised element with multiple noise killing devices. Note that every said device has elongated cavity (4) of total volume Vc to open toward lateral wall (210). Note that said cavity features total length Lc larger than said length Lt and geometry that includes several interconnected parts (40, 41, 42, 43, 44, 45). Note also that length Lc makes the sum of parts of said cavity. Note that every said cavity (4) extends over the entire length Lc with notch (5) extending radially outward out to rolling surface. Note that sum tread sum Ly of lengths in projection in crosswise direction of every cavity is at least 1.5 times larger than the sum Lx of length in projection if the cavity circumferential direction.

EFFECT: perfected noise killing.

9 cl, 8 dwg

Automotive tire // 2521033

FIELD: transport.

SUBSTANCE: invention relates to automotive winter tire tread design. Tire (1) has tread (2) containing central part (L1) covering from two sides the equatorial plane (7), and two shoulder parts. The central part (L1) is separated from shoulder parts (L2, L3) of tread by two first circumferential grooves (3, 6). At least two second circumferential grooves (4, 5) are located in the central part (L1). The second circumferential grooves (4, 5) determine margins of the central circumferential bar (10) containing multiple sipes (20) located in parallel to each other and at certain distance from each other. The second circumferential grooves (4, 5) have a mid line running as peak-to-valley scallops throughout tire length in direction along circumference. The mid lines with peak-to-valley scallops are mainly matching in phase with each other throughout tire length (1) in direction along circumference.

EFFECT: better operational properties when moving both over snowy and dry and wet road surfaces.

20 cl, 4 dwg, 1 tbl

Pneumatic tire // 2520265

FIELD: machine building.

SUBSTANCE: proposed tire comprises tread zone (A) located from vehicle inner side and tread zone (B) located on vehicle outer side. There are multiple slot-like drain grooves (32A, 32B) extending over tire width and formed in every block (31A, 31B). The number of blocks (31A) in said zone (A) is larger than that of blocks (31B) in said zone (B). Note here that slot-like drain grooves (32B) in blocks (31B) of zone (B) are configured to extend linearly along their depth. Note here that slot-like drain grooves (32A) in blocks (31A) of zone (A) are configured to extend in wavy manner along their depth.

EFFECT: better road grip on dry road and snow.

7 cl, 4 dwg

Pneumatic tire // 2519327

FIELD: transport.

SUBSTANCE: method is executed by means of making multiple wave-shaped grooves (20) in central belt (16) of tread between two ring grooves (14) located with tilt relative to equatorial plane of tire and consisting of central small elements (26) equatorial plane CL and side small elements (28) at two sides of this equatorial plane. In each of side small elements (28), the second transversal groove (40) is made containing wide area (42) and narrow area (44). Reducing fragmentation of rubber and cracking in side small elements (28) is achieved due to formation of area (54) with raised bottom on periphery of the first acute-angled area (50) and formation of the first bevelled area (56A) on sharp end of the first acute-angled area (50).

EFFECT: lower noise level, rubber fragmentation and cracking in tread elements, higher dewatering capability.

4 cl, 3 tbl, 13 dwg

FIELD: transport.

SUBSTANCE: tread contains multiple grooved obstructing elements (4) which are formed by and located in circular grooves (2). Herewith, obstructing elements (4) go from bottom (21) of circular groove (2) and blocks at least 70% of cross-section area of circular groove (2). Bending parameter of grooved obstructing elements (4) is determined as E·I/(h3l), where E is module at 10% elongation of material used for grooved obstructing elements, I is inertia moment of grooved obstructing element cross-section, h is height of grooved obstructing element, and l is width of grooved obstructing element, and ranges from 250 Pa to 350 Pa.

EFFECT: providing grooved obstructing elements wear to degree equivalent to tread section wear degree while reducing noise caused by resonance of air columns and maintaining retraction characteristics.

6 cl, 6 dwg, 1 tbl

Pneumatic tire // 2513210

FIELD: transport.

SUBSTANCE: invention relates to tread pattern of tire designed to be used on dry road, ice- and snow-covered roads. Proposed tire comprises unidirectional tread pattern including right and left lengthwise grooves of the crown and crow rib arranged there between. Crown rib has first and second V-like grooves arranged by turns in the tire lengthwise direction. First V-like grooves extend from the left lengthwise groove of the crown. Second V-like grooves extend from the right lengthwise groove of the crown. First and second V-like grooves terminate nearby the rib while their V-like configurations have inflections located, in fact, at tire equator.

EFFECT: stable motion on dry road, ice- and snow-covered roads.

9 cl, 10 dwg, 1 tbl

Pneumatic tire // 2508996

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, namely, to tread pattern. Proposed tire comprises multiple circular main grooves extending in tire circumference and multiple running surfaces separated and composed by said circular main grooves in tread zone. Multiple running sections have multiple sipes. At least 90% of sipes located in inner side area represent are 2D sipes and at least 90% of sipes in outer side surface are 3D sipes. Tread zone comprises top and bottom rubber layers. Rubber hardness H1in at -10°C and rubber hardness H2in at 20°C of rubber top layer 151in in inner side area, and hardness H1out at -10°C and hardness H2out at 20°C of rubber top layer 151out in outer side area are related by relationships H1in<H1out and H2in<H2out.

EFFECT: better stability on dry and snowy surface.

18 cl, 9 dwg

Pneumatic tire // 2508995

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, namely, to tread pattern. Tire tread has circular major grooves extending in tire circumference and contact parts separated and composed on said circular major grooves. Every said central zone contact part and contact parts of right and left shoulder zone has multiple sipes. At least 90% of sipes located in inner side area represent are 2D sipes in central zone and at leas 90% of sipes in outer side surface are 3D sipes in shoulder zone. Every contact parts of right and left shoulder zones has multiple transverse side grooves arranged in definite order in tire circumference. The number N-ce of transverse side grooves in central zone contact part and the number N-sh of transverse side grooves in contact parts of right and left shoulder zones are relates as N-ce>N-sh.

EFFECT: perfected design.

20 cl, 7 dwg

FIELD: transport.

SUBSTANCE: invention relates to automotive industry, namely, to tread pattern. Tire features tread asymmetric patter wherein ratio of actual area of contact to total area for zone 2o of outer side is larger than that for inner side zone 2i but with minor difference characteristic of water removal for right and left wheel tires. Said tire has tread surface 2 divided by four lengthwise grooves 3 and 4 into central area 5 of contact with soil, mid areas 6,6 of contact with soil and shoulder areas 7,7 of contact with soil. Said mid area 6o and shoulder area 7o in outer side zone 2o are divided by outer mid transverse grooves 8o and outer shoulder transverse grooves 10o into blocks 9o and blocks 11o. Mid transverse grooves 8o are inclined in opposite direction to inclination of shoulder transverse grooves 10o relative to tire axial direction while transverse grooves 8o and 10o are inclined at angle θmo of 5-45° and at angle θso over 0° and not over 40°, respectively.

EFFECT: better stability in rainy and dry weather.

8 cl, 6 dwg, 1 tbl

FIELD: tire industry.

SUBSTANCE: proposed tire is provided with tread having two deep circular grooves separating central zone from two side shoulder zones furnished with shoulder blocks. Sum of width values of shoulder zones in tread is either equal to or less than 60% of its summary width. Width of each shoulder zone is not less than 20% of summary width. Each circular groove at side separated from central zone adjoins continuous path from which cross grooves branch to limit shoulder blocks.

EFFECT: increased wear resistance of tire.

10 cl, 9 dwg

Up!